Pirn changing device



1953 s. WIGET EI'AL- 2,836,202

PIRN cmmcmc navzcz Fill-0d Sept. 2, 1955 2 Sheets-Sheet 1 IN VE N TORSGEORG WIGET YGLLSI'PM DUBS Mun-w. My

May 27, 1958 G. WIGET EIAL PIRN CHANGING DEVICE 2 Sheets-Sheet 2 FiledSept. 2. 1955 IN VE N TORS EEORG NIGE'T GUSTAV D05 Arry I 2,836,202Patented May 27, 1958 PIRN CHANGING DEVICE Georg Wiget and Gustav Dubs,Arbon, Switzerland, as-

signors to Societe Anonyme Adolphe Snorer, Arhon, SwitzerlandApplication September 2, 1955, Serial No. 532,221

Claims priority, application Switzerland October 6, 1954 Claims. (Cl.139-232) This invention relates to looms, and more particularly to loomsof the automatic changer type.

Pirn change devices are known where the loom is provided with a magazinecomprising a number of compartments disposed side by side, each of whichis designed to accommodate a distinct series of pirns; these variousseries are distinguished from one another by the color and/ or fibercharacteristics of their threads. With known changers of this kind, thefull pirn selected by the agency of the pirn feeler on the loom, dropsby gravity from the magazine into the transfer position to betransferred to the shuttle by the hammer, the pirn to be replaced beingthrown out simultaneously. Devices of this type suffer from the seriousdrawback that quite frequently, the drop of the exchange pirn is delayedby jamming; moreover, it is by no means an uncommon experience withdevices of this kind that the pirn, once it has arrived in the transferposition, does not budge from this position if for some reason, anorderly transfer does not take place.

It is a primary object of this invention to eliminate these drawbacks,and to provide automatic pirn changers insuring an undisturbedperformance of the loom.

Other objects, and the manner in which the same are attained, willbecome apparent as this specification proceeds.

The invention contemplates providing a loom with a pirn changer whereineach compartment of the magazine has coordinated with it, a movable pirnguard which in its normal position, is designed to intercept the pirnresting at the bottom of the pile in the compartment, and where forpurposes of every pirn change operation, the respective pirn guard ismoved automatically into a transfer position, common to all the guards,located above the shuttle which is to receive the pirn.

A preferred embodiment of the invention provides pirn guards of oblongconfiguration one end of which is hinged to a support common to all theguards, while their other ends are mounted for displacement controlledby curved guides which cause the pirn guards moving from intercepting totransfer position, to follow a path extending downward and sideways.

Advantageously, the pirn guards are flexibly connected with slides thedisplacement of which is controlled by the curved guides, and theseguides are all arranged in one and the same shield.

In the drawings affixed to this specification and forming part thereof,a preferred embodiment of the invention is illustrated diagrammaticallyby way of example.

In the drawings:

Fig. 1 is a side elevation, partly in section, of a device according tothe invention;

Fig. 2 shows two horizontal sections taken along lines II (upper half ofFig. 2) and II-II (lower half of Fig. 2) in Fig. 1; M

Fig. 3 is an end'view looking at the device of Fig. l

from the left, and incorporating auxiliary mechanism, and

Fig. 4 is a vertical section (on a larger scale) taken along lineIII-III in Fig. 1.

Referring to the drawings wherein like elements are denoted by identicalreference numerals and characters, and first to Fig. 1, the magazine 1which in horizontal section, has the configuration of a circular sector(Fig. 2), comprises two peripheral walls 2 and 3 and provided in thesewalls, four sets of radially opposed grooves 4 and 5 which subdivide themagazine into four parallel compartments A, B, C'and D (Fig. 4). Each ofthe compartments A, B, C, D is designed to accommodate a series of pirnsE. Facing the larger peripheral wall, 2, of the magazine 1 is a headplate 6 which is provided with four curved guide slots 7, S, 9 and 10(Figs. 2, 3) which are correlated with the four compartments A, B, C andD of magazine 1, and which extend downward and toward the verticalcentral plane of head plate 6. Each of the curved guide slots 7, 3, hand it mounts for vertical displacement, an oblong slide 11 which haspins 12 and 13 engaging the slot; the upper pins 13 are attached to adraw spring 14 which aims at keeping the respective slides 11 in theirupper, rest positions.

Below each compartment A, B, C and D, there is arranged a pirn guard 15the horizontal section of which, over the length of the compartment,corresponds to the rectangular section of the compartment, but which iselongated to extend way beyond the confines of the magazine, by means oflongitudinal arms which, as shown in Fig. 2, converge to be hinged, sideby side with the other guard ends, by a bolt 16, a connecting piece 17and a common bearing bolt 18 disposed at right angles to the bolts 16,i. e. an arrangement in the nature of a universal joint, to a fixedmount 19. At their opposite ends the pirn guards 15 are provided withpins 15' the ball-shaped heads of which engage cylindrical openings 11disposed in the slides 11, thus establishing ball-andsocket jointsconnecting the pirn guards 15 with the slides 1.1. The pirn guards 15,the plan view of which (Fig. 2) shows oblong frames closed uponthemselves, mount, on each of their side arms, a leaf-type clampingspring 29 (Fig. 4) to serve as an elastic bottom closure. The

\ top of the mount 19 carries a series of pegs 21 forming a combdesigned to accommodate in spaced relationship,

' the free ends of the threads e emanating from the pirns E.

Referring in particular to Fig. 3, a guide rod 22 is connected with apirn feeler device (not shown) provided for the shuttles. The guide rod22 controls a bell crank lever 23 which is pivotally supported on afixed bolt 24 to assist in controlling a pushing rod25 pivoted to theupper arm of the bell crank lever 23. The pushing rod 25 is alsoconnected, by a guide rod 26, with the upper arm of a bell crank lever27 which is pivotally supported on a fixed bolt 28 and the second arm ofwhich is connected with a control rod 29 whose movements are governed bythe control for the vertical displacement of the shuttle box (drop box).

in Figs. 3 and 4, 3t! denotes the hammer provided to eject the exchangepirns E; the hammer is controlled by the pirn feeler device in a mannerknown in the art. The hammer 39 is pivotally mounted on a fixed bolt 31.F denotes a shuttle, and G an empty pirn still in the shuttle but aboutto be replaced by a full replacement pirn. At the bottom of eachcompartment A, B, C and D of the magazine 1, a shaft 32 pivotallysupports a twoarmed stop pawl 33 which is influenced by a draw spring34. This spring tends to keep the pawl 33 in a position where its longerarm extends into the path of any pirn emergingfrom the respectivecompartment, for the purpose of preventing the bottom pirn E fromissuing from the compartment prematurely.

. The above described preferred embodiment of the invention operates inthe following manner:

Supposing a weaving operation uses a pirn-E deriving from compartment D(Fig. 4), and the control rod 29 is in its lowermost position whichit'assunied in'the' course of the preceding transfer operation, wherethe twoarmsof the hell crank lever 27 take up the positions marked IV inFig. 3. If, for example, weaving is to proceed with a pirn E of theseries stored incompartment A, the pirn change is initiated in such amanner that the changeraggregate causes the respective shuttle box tomove into that position where the shuttle shed is in trans fer positionwith respect to the corresponding pirn. At the same time, the controlrod 29 is automatically displaced upward until the bell crank lever 27assumes the position indicated by I, I in Figf 3fwhereoy the pushing rod25 controlled by the guide rod 26, is in its turn moved into its I, Iposition. a a When the supply of thread on the working pirn isexhansted, thefeeler device initiatesthe exchangerof pirns 'bycausingthe guide rod 22 'to displace the bell crank lever 23 clockwise. Thepushing rod 25 linked to the bell crank lever 23 pushes the slide 11correlated with compartment A, downward on shield 6,- counteracting willbe apparent to any person skilledin the art which would not depart fromthe spirit of 'the invention nor the influence of spring 14 on the pin13, with the result that the bottom pirn E in compartment A is movedinto the transfer position, i. e. first is moved into the correspondingpirn guard 15 which in turn moves the inter- 'cepted pirn E, by adownward (Fig. l) and sideways (Fig. 3) displacement from interceptingto releasing position, just above the shuttle F intended to receive thenew pirn (Figs. 3, 4). The full pirn E is now in proper 'position forbeing transferred by means of the hammer 30, into the shuttle Fwhereupon the hammer 30 returns to the initial, rest position. At thesame time, the feeler device moves theguide rod 22 (to the right in Fig.3), causing the bell crank lever 23 to be displaced counterclockwise sothat the pushing ,rod 25' too returns into its initial position (Fig.3). Spring 14 is now free to return slide 11 whereby also thecorresponding pirn guard 15 is brought back into its normal position'where it stays just below the respective compartment of the pirnmagazine until it is displaced again in a subsequent pirn changeoperation.

The pirn changer of the invention has a number of sacrifice anyadvantages thereof.

We claim: 1. A pirnchanger for use in looms number of distinct pirnguards each correlated with one of said compartments and normallydisposed there-below whereby to be in a state of preparedness tointercept 'a pirn from the respectivecompartment, andrmeans for ceptingto. thecommon transfer position along a downward and sidewayspath. v

3; A pirn changer according to claim 2, wherein the pirn guards comprisea substantially rectangular, pirn accommodating portion, and graduallynarrowing exten- 'sions, said extensions converging toward the universalmount common to all the pirnguards. y

4. A pirn changer according to claim 2" wherein the. other ends of thepirn guards are universally mounted in slidesysaid slides being mountedfor displacement along the curved guides, and ahead plate is provided onwhichthecurved guides are disposed.

5. A pirn changer comprising,.in combination with a mold-compartmentpirn storage magazine and a shuttle to which pirnsfrom said magazine areto be transferred,

a number of distinct, separately displaceable 'pirn guards eachcorrelated ,with'one. of said compartments and normally disposedthere-below, whereby to bein a state of preparedness to intercept a pirnfrom saidcompartment,

saidpirn guards including pirn accommodating portions and extensions, acommon universal mount for all the said extensions, a head plate'at theother end of said pirn guards, curved guides disposed on said headplate, slides mounted for displacement in said curved guides and, 7universal mounts for supporting 'the end of each pirn.

guard in proximity to the pirn accommodation portion, in one of saidslides, whereby *to displace only the .pirn

guard actively engaged in a pirn change, along adownward and sideways.path, from transfer position.

References Citerl in the iile of this patent UNITED STATES PATENTS i1,032,463 Wy'man July 16, 1912 and the like for transferring from amulti-cqmpartment magazine store. ing various'series of pirns, a pirnfrom any one of the compartments to a shuttle, comprising incombination, a

the intercepting to' the

